APPARATUS FOR DETERMINING DISTANCE TO WATER SURFACE Russian patent published in 2015 - IPC G01S13/88 G01F23/00 

FIELD: radio engineering, communication.

SUBSTANCE: method is carried out by including an amplitude detector in a frequency-modulated receiving-transmitting device between a beat voltage amplifier and a unit for determining beat frequency, as well as including: a vertical tube with the end up, a unit of fixed horizontal bars rigidly connected to said tube and a vertical post, a vertical rounded rod inside the tube, a floating object on the surface of the water body rigidly connected to said rod, a metal flat rod rigidly connected to said floating object and having electromagnetic coupling with a fixed transmitting antenna turned downwards, and a fixed receiving antenna of the frequency-modulated receiving-transmitting device.

EFFECT: high accuracy of determining distance in the presence of perturbations without using additional electronic apparatus.

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